I purchased StuffRadar a while back and there haven't been any updates. Is it still in development?
No, we pulled StuffRadar from the iTunes AppStore and then stopped development. If your iPhone breaks, you can restore vCarder from the backups iTunes makes of your device, but it isn't available for download from the AppStore anymore and we don't have any way of providing a download outside of it.
StuffRadar was based on Amazon's interface for mobile product queries. Prior to the release of the Amazon app, access to that data was restricted. This made StuffRadar redundant and it's the reason why it isn't maintained anymore.
StuffRadar was developed and tested with iOS 2, compatibility with later versions may stop at some point.